John Muir (1997). “Nature Writings: The Story of My Boyhood and Youth, My First Summer in the Sierra, the Mountains of California, Stickeen, Selected Essays”, p.814, Library of America
Speech accepting nomination as Republican candidate for president in Elwood, Indiana (August 17, 1940); as quoted in "This Is Wendell Willkie" by Wendell Willkie, (p. 273 - 274), 1940.